Which molecules would most likely cause a liquid to have the lowest viscosity?

• A. Large, polar molecules
• B. Small, nonpolar molecules
• C. Small, polar molecules
• D. Large, nonpolar molecules

Answer: (B)

Verified step by step guidance

1. Understand the concept of viscosity: Viscosity is a measure of a fluid's resistance to flow. Liquids with high viscosity flow slowly, while those with low viscosity flow easily.
2. Consider the molecular size: Large molecules tend to have higher viscosity because they can become entangled, making it harder for the liquid to flow.
3. Consider the polarity of molecules: Polar molecules have stronger intermolecular forces, such as hydrogen bonding, which can increase viscosity. Nonpolar molecules have weaker intermolecular forces, leading to lower viscosity.
4. Identify the combination that leads to the lowest viscosity: Small, nonpolar molecules are less likely to interact strongly with each other, allowing the liquid to flow more easily.
5. Apply this understanding to the options given: Small, nonpolar molecules would most likely cause a liquid to have the lowest viscosity due to their size and weak intermolecular forces.